PERLUTIL

NAME

perlutil - utilities packaged with the Perl distribution

DESCRIPTION

Along with the Perl interpreter itself, the Perl distribution installs a
range of utilities on your system. There are also several utilities
which are used by the Perl distribution itself as part of the install
process. This document exists to list all of these utilities, explain
what they are for and provide pointers to each module's documentation,
if appropriate.

LIST OF UTILITIES

Documentation

perldoc

The main interface to Perl's documentation is "perldoc", although
if you're reading this, it's more than likely that you've already found
it. perldoc will extract and format the documentation from any file
in the current directory, any Perl module installed on the system, or
any of the standard documentation pages, such as this one. Use
"perldoc <name>" to get information on any of the utilities
described in this document.

pod2man and pod2text

If it's run from a terminal, perldoc will usually call pod2man to
translate POD (Plain Old Documentation - see perlpod for an
explanation) into a manpage, and then run man to display it; if
man isn't available, pod2text will be used instead and the output
piped through your favourite pager.

pod2html

As well as these two, there is another converter: pod2html will
produce HTML pages from POD.

pod2usage

If you just want to know how to use the utilities described here,
pod2usage will just extract the ``USAGE'' section; some of
the utilities will automatically call pod2usage on themselves when
you call them with "-help".

podselect

pod2usage is a special case of podselect, a utility to extract
named sections from documents written in POD. For instance, while
utilities have ``USAGE'' sections, Perl modules usually have ``SYNOPSIS''
sections: "podselect -s "SYNOPSIS" ..." will extract this section for
a given file.

podchecker

If you're writing your own documentation in POD, the podchecker
utility will look for errors in your markup.

splain

splain is an interface to perldiag - paste in your error message
to it, and it'll explain it for you.

roffitall

The "roffitall" utility is not installed on your system but lives in
the pod/ directory of your Perl source kit; it converts all the
documentation from the distribution to *roff format, and produces a
typeset PostScript or text file of the whole lot.

Converters

To help you convert legacy programs to more modern Perl, the
pl2pm utility will help you convert old-style Perl 4 libraries
to new-style Perl5 modules.

Administration

libnetcfg

To display and change the libnet configuration run the libnetcfg command.

perlivp

The perlivp program is set up at Perl source code build time to test
the Perl version it was built under. It can be used after running "make
install" (or your platform's equivalent procedure) to verify that perl
and its libraries have been installed correctly.

Development

There are a set of utilities which help you in developing Perl programs,
and in particular, extending Perl with C.

perlbug

perlbug is the recommended way to report bugs in the perl interpreter
itself or any of the standard library modules back to the developers;
please read through the documentation for perlbug thoroughly before
using it to submit a bug report.

perlthanks

This program provides an easy way to send a thank-you message back to the
authors and maintainers of perl. It's just perlbug installed under
another name.

h2ph

Back before Perl had the XS system for connecting with C libraries,
programmers used to get library constants by reading through the C
header files. You may still see "require 'syscall.ph'" or similar
around - the .ph file should be created by running h2ph on the
corresponding .h file. See the h2ph documentation for more on how
to convert a whole bunch of header files at once.

c2ph and pstruct

c2ph and pstruct, which are actually the same program but behave
differently depending on how they are called, provide another way of
getting at C with Perl - they'll convert C structures and union declarations
to Perl code. This is deprecated in favour of h2xs these days.

h2xs

h2xs converts C header files into XS modules, and will try and write
as much glue between C libraries and Perl modules as it can. It's also
very useful for creating skeletons of pure Perl modules.

enc2xs

enc2xs builds a Perl extension for use by Encode from either
Unicode Character Mapping files (.ucm) or Tcl Encoding Files (.enc).
Besides being used internally during the build process of the Encode
module, you can use enc2xs to add your own encoding to perl.
No knowledge of XS is necessary.

xsubpp

xsubpp is a compiler to convert Perl XS code into C code.
It is typically run by the makefiles created by ExtUtils::MakeMaker.

prove is a command-line interface to the test-running functionality
of Test::Harness. It's an alternative to "make test".

corelist

A command-line front-end to "Module::CoreList", to query what modules
were shipped with given versions of perl.

General tools

A few general-purpose tools are shipped with perl, mostly because they
came along modules included in the perl distribution.

piconv

piconv is a Perl version of iconv, a character encoding converter
widely available for various Unixen today. This script was primarily a
technology demonstrator for Perl v5.8.0, but you can use piconv in the
place of iconv for virtually any case.

ptar

ptar is a tar-like program, written in pure Perl.

ptardiff

ptardiff is a small utility that produces a diff between an extracted
archive and an unextracted one. (Note that this utility requires the
"Text::Diff" module to function properly; this module isn't distributed
with perl, but is available from the CPAN.)

ptargrep

ptargrep is a utility to apply pattern matching to the contents of files
in a tar archive.

shasum

This utility, that comes with the "Digest::SHA" module, is used to print
or verify SHA checksums.

zipdetails

zipdetails displays information about the internal record structure of the zip file.
It is not concerned with displaying any details of the compressed data stored in the zip file.

Installation

These utilities help manage extra Perl modules that don't come with the perl
distribution.

cpan

cpan is a command-line interface to CPAN.pm. It allows you to install
modules or distributions from CPAN, or just get information about them, and
a lot more. It is similar to the command line mode of the CPAN module,

perl -MCPAN -e shell

instmodsh

A little interface to ExtUtils::Installed to examine installed modules,
validate your packlists and even create a tarball from an installed module.